Insecticidal oil



Patented Sept. 3,1935 it I 21.013. V msscnom on." I p mnaueaueua'mrsmmw' steam-a oilllevelopment Company, a or V UNITED' STATES 'PATENTOFFICE No Drawlnxmuses mu. iau

SeflalNo. 522.119 1 claims. (on. low-u) The present invention relates to insecticidal are greatly improved by my invention. The ad;- oils containing in solution a larger amount or vantages oi. my invention become especially prorotenon or rotenoids than have heretofore been. nounced by dissolving a ut 0.1% or more or incorporated by known methods. Rotenon' is the rotenon or an equivalent a cunt of rotenoids in active principle of certain plants known as flsh the on." The oil usedior such purpose is'usually 5 poisons, such as derris, cube. "etc. The term a viscous non-volatile oil, such as heavy gas oil rotenoid is used to designate insecticidal prinor light lubricating oil but sometimes lighter oils, ciples of the same plants "which are not exactly such as kerosene, are alsoused for horticultural identical with rotenon in theirchemieal consti sprays. The amount of highly chlorinated hy- 0 tution but have a similar insecticidal action. drocarbon which isnecessary to keep the rotenon I ave discovered that all halogenated hydro-. or rotenolds in solution is about to 25 times carbons containing more than about 25%- oi the amount 01' rotenon or rotenoids, depending on chlorine or an equivalent amount 01' other halothe nature or theoil. f gens, such as iodine, bromine, are-not only good It is known to those skilled in the art that it is 1 solvents in themselves for rotenons and rotenolds diilicult to prepare an oil spray'which will em- '15 but also increase the solubility of such insecti-' ciently destroy the insect pests on the trees and ida p in ipl s i ils, while by themselves. they at the same time be entirely sate and harmless to a e y so ubl n oil. he his y'halosenated the tree. Ii the amount or oil is reduced in the hydrocarbons act, therefore, as mutual solvents horticulturalspray below 14%, the same, he-

for h r en n, o ioids, and the oil. comes harmless to the tree but at the same time 29 7 non and rotenoids in solution.

The mutual solvent action oi. the highly haloit loses its insect killing power. By the addition eenated hydrocarbons becomes ,a very valuabl or about 0.1% to 5% oi. rotenon or an eqinvaient factor in the preparation or certain insecticidal amount oi rotenoids the insecticidal valueof the oils. i oil spray is sogreatly increased that. the control Kerosene 1' il n p ha ctions. either or the pests becomes eilicient even at concentra- 25 alone o c n a nin p re um extmethave for tions or far below 2% or oil. say 1% or less 01' oil a long time been used for killing household inin the spray. The emulsiilcafion in water may sects, such as flies, roaches, bed bugs, etc. The either be mechanical or by-use oi casein or power of su h k r sene or na a s saponin or by introduction into the oil or other greatly increased by dissolving rotenon. in it. emulsifying principles such as oil soluble sulio- .30 Up-to the present time very large amounts of the tg, m th ulamm a men, solvent were required in order to keep the rote- The iollowingexamples will illustrate some 01' the compositions obtained by the present in- Rotenon in the amount of 0.02-0.2%in the venflon: r 1 i g 5 kerosene issuflicient i'or greatly increasing its Example 1 insecticidal value. It is important that this amount can be kept in solution by means of a 3 E 1 7 p comparatively small amount of mutual solvent. 1 30 m hllogemted mlihthelene (mom I The following example will illustrate the amount 011) 9 10 s avity 40 that is necessary oi the mutual solvents which 1 8 fl Iorm the subject matter of the present inven-' 3mm 2 tion: I v a I 1.5 gramsroteno g 1 gram rotenon e 20 gram; halogenated naphthalene o1 Specific fi m m ted gasoline gravity 1.2 4 1 1 mm kerosene 1 liter oi petroleum oil having a gravity of 27 A.P.I.andaviscosityoi 115 at 100 F.

ample 5o" non-volatile. Easily volatiz a'ble' petroleum' An aqueous emulsion containing 0.7% or the 50 such as'petroieun ether, are unsatisfactory for composition given in Example 1.

use as household insecticides due to theirini'iam- The solutions of Mom in non-volatile petromability.

The horticultural and agricultural oil sprays vents. such ashalogenated naphthalene-undiluare another important insecticidal oil class which ogenated gasoline ontainin 25% oi chlorine are characterized by a great stability due to the non-volatile character or the mutual solvent.

Having thus described my invention, what I claim is:

1. An insecticidal preparation comprising a relatively non-volatile petroleum oil, insecticidal material selected from the group consisting of rotenon and rotenoids and a non-volatile highly halogenated hydrocarbon with a halogen content corresponding to not less than 25% of chlorine.

2. An insecticidal composition consisting of a non-volatile viscous petroleum oil containing not less than 0.1% from the group consisting of rotenon and rotenoids and not less than 1.5% highly halogenated hydrocarbon.

3. An insecticidal composition consisting of a non-volatile viscous petroleum oil containing not of insecticidal material selected of a non-volatile less than 0.1% of insecticidal material selected from the group consisting of rotenon and rotenoids and not less than 1.5% or substantially nonvolatile of halowax.

'4. An insecticidal composition consisting of a non-volatile viscous petroleum oil containing not less than 0.1% of insecticidal material selected from the group consisting of rotenon and rotenoids and not less' than 1.5% of highly chlorinated gasoline, the amount of chlorinated gasoline being sufficient to keep the insecticidal material dissolved in the petroleum oil.

5. An aqueous emulsion containing less than 2% of the composition according to claim 2.

6. An aqueous emulsion containing less than 2% of a composition according to claim 2.

7. An aqueous emulsion containing less than 2% of a composition according to claim 4.

HYYM E. BUC. 

